Nitrile rubbers having low emission values
AssigneeLANXESS Deutschland GmbH
InventorsSven BRANDAU, Andreas KAISER, Hans MAGG, Uwe WESTEPPE
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Abstract
An improved polymerization process using a specific molecular weight regulator makes it possible to produce new nitrile rubbers featuring particularly low emission values and giving vulcanizates which have an advantageous profile of properties and which are of outstanding quality, in particular in odour-sensitive applications.
Claims14
A vulcanizable mixture comprising at least one crosslinker and a nitrile rubber comprising repeat units of at least one α,β-unsaturated nitrile monomer and at least one conjugated diene monomer, wherein the nitrile rubber has an emission quotient E according to general formula (I) of less than or equal to 0.25 mg/(kg*Mooney units)
- E
- =
- [
- volatile
-
-
- constituents
- ]
- [
- Mooney
-
-
- viscosity
- ]
- ×
- [
- nitrile
-
-
- content
- ]
- 100
- (
- I
- )
- where
- [volatile constituents] is the volatile constituents concentration in mg/kg of nitrile rubber determined by TDS GC-MS analysis according to VDA recommendation 278 (version September 2002) between 28.4 min and 34.0 min,
- [Mooney viscosity] is the Mooney viscosity ML 1+4 at 100° C. of the nitrile rubber in Mooney units determined according to ASTM D 1646, and
- [nitrile content] is the dimensionless α,β-unsaturated nitrile content in the nitrile rubber, wherein such content is determined in % by weight pursuant to DIN 53 625 according to Kjeldahl.
Dependencies are inferred from the claim text.